This conjunction modifies certain verbs in ways prescribed
in their definitions. For example, =!.t is the relation of
equality using tolerance t ,and ^!.r
is the factorial function so defined that x ^!.r n
is */x + r * i. n .Consequently, ^!._1
is the falling factorial function.

Fit applies to the following verbs (to produce variants).
The monadic case is shown before a bullet, and the dyadic case after it: